Skirt for a plumbing fitting



FIG. 1 is a perspective view taken from the top and a side of a skirt for a plumbing fitting embodying my new design;

FIG. 2 is a side elevational view thereof, the other sides being the same as the side shown;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

The broken line representation of a plumbing handle in FIG. 2 is for purposes of illustration only and forms no part of the claimed design. 

The ornamental design for a skirt for a plumbing fitting, as shown and described. 